CN104768194A - Handover method and apparatus in a wireless communication system including femto cells - Google Patents

Handover method and apparatus in a wireless communication system including femto cells Download PDF

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Publication number
CN104768194A
CN104768194A CN201510178011.3A CN201510178011A CN104768194A CN 104768194 A CN104768194 A CN 104768194A CN 201510178011 A CN201510178011 A CN 201510178011A CN 104768194 A CN104768194 A CN 104768194A
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China
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csg
measurement report
base station
target henb
target
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CN104768194B (en
Inventor
林彩权
廉泰善
崔成豪
裵范植
林娴娜
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions

Abstract

A handover method and apparatus for facilitating a handover of a user equipment to a femto cell in a wireless communication system supporting both the femto and macro cells. When a handover condition is detected, the user equipment acquires identity information of a target femto cell base station from system information transmitted by the target femto cell base station, decides whether to handover to the target femto cell base station, based on the identity information; and transmits a measurement report message including the identity information to a serving base station of the user equipment, when the handover is to be made.

Description

Comprise the switching method and apparatus in the wireless communication system of Femto cell
The divisional application that this case is the applying date is on February 11st, 2010, application number is 201080016404.X, denomination of invention is the application for a patent for invention of " comprising the switching method and apparatus in the wireless communication system of Femto cell ".
Technical field
The present invention relates generally to radio communication, and more specifically, relate to the switching method and apparatus for promoting the switching to Femto cell in the wireless communication system comprising Femto cell (femto cell) and macrocell.
Background technology
Femto cell is designed for the small-sized honeycomb base station that the short distance being provided in about 10 meters that use in family or small enterprise covered and arrived the broadband connection of core network.Usually, the cellular network in the propagation chamber of Femto cell covers, and provides high-quality and fixing-mobile aggregated service to user.
In 3rd generation Partnership Program (3GPP), considered the environment that wherein closed user group (CSG) community and traditional macrocell coexist.Generally, term " CSG cell ", " Femto cell ", " CSG cell base station " and " femto cell base station " are that synonym uses.In 3GPP Long Term Evolution (LTE) system, enode b (eNB) represents macro cell base station, and family eNB (HeNB) represents femto cell base station (CSG cell base station).
Be designed for and support that the network architecture of Femto cell makes it possible to dispose multiple femto cell base station and makes subscriber equipment (UE) can measure the signal of Femto cell and macro cell base station (or eNB).For the switching between macrocell eNB, UE analyzes the signal of switching target eNB transmission to obtain physical district ID (PCI), and Based PC I sends measurement report to current service eNB, can make switching determining to make service eNB.
But for (that is, HeNB) or the switching from HeNB to another HeNB from macrocell eNB to Femto cell eNB, network also must determine whether to allow particular UE access target HeNB.Therefore, need to develop for promoting that UE is to the method for the switching of Femto cell (CSG cell or HeNB) in the wireless communication system of the deployment supporting Femto cell.
Summary of the invention
The invention provides and can consider that the mobility of UE promotes the switching method and apparatus of the switching to Femto cell in the wireless communication system supporting Femto cell and macrocell.
According to embodiments of the invention, provide a kind of in the wireless communication system comprising Femto cell the measurement report method for the switching of subscriber equipment (UE).The method comprises: detect switching condition by UE; From the system information that target femtocell base station (BS) sends, the identification information of target femtocell BS is obtained by UE; Determined whether to be switched to target femtocell BS based on this identification information by UE; And when UE determines to be switched to target femtocell BS, to be sent to the serving BS broadcasts of UE by UE and comprise the measurement report message of this identification information.
According to another embodiment of the present invention, a kind of switching device shifter of the wireless communication system for comprising Femto cell is provided.This device comprises: memory cell, and it stores the permission access list of the identification information of the femto cell base station (BS) comprising the access allowing subscriber equipment (UE); Femto cell identification information extractor, when requiring to switch, it is from the identification information allowing searched targets Femto cell BS access list; Allow access Femto cell validator, its identification information by receiving target Femto cell BS and by the identification information of reception with verify target femtocell BS from allowing the identification information retrieved access list to compare; And measurement message generator, when target femtocell is verified, it produces measures message and sends the serving BS broadcasts of this measurement message to UE.
According to another embodiment of the present invention, a kind of method of attempting the femto cell base station (BS) be switched in the wireless communication system comprising Femto cell for verifying user equipment (UE) is provided.The method comprises: the handover request message being received the identification information of the target femtocell BS comprised for switching by Femto cell BS from Mobility Management Entity; By Femto cell BS, the current identification information of the identification information of target femtocell BS and Femto cell BS is compared to determine whether identification information corresponds to each other; When identification information corresponds to each other, accept the switching of subscriber equipment to target femtocell BS by Femto cell BS.
According to another embodiment of the present invention, a kind of femto cell base station (BS) comprising the wireless communication system of multiple Femto cell and macrocell is provided.This Femto cell BS comprises: radio frequency (RF) unit, and it receives the handover request message comprising the identification information of target femtocell BS, and this handover request message is sent by Mobility Management Entity; Memory cell, it stores the cell information of Femto cell BS; Control unit, it extracts the identification information of target femtocell BS from handover request message; And cell ID validator, it compares to verify that Femto cell BS is target femtocell BS by the identification information of the target femtocell BS by reception and the current identification information of femto BS, and when receive the identification information of target femtocell BS with the current identification information of femto BS to accepting the switching of UE to Femto cell BS time corresponding.
According to another embodiment of the present invention, the changing method of the subscriber equipment (UE) in a kind of wireless communication system comprising multiple Femto cell is provided.The method comprises: determine that switching condition is satisfied by UE; The measurement report message comprising the identification information of target femtocell BS is sent from UE to serving BS (BS); The switching of target femtocell BS is determined at serving BS broadcasts place; Send the requirement comprising the identification information of target femtocell BS from serving BS broadcasts to Mobility Management Entity and switch message; Determined whether UE to be switched to target femtocell BS by Mobility Management Entity; When Mobility Management Entity is determined to switch UE, send the handover request message comprising the identification information of target femtocell BS from Mobility Management Entity to target femtocell BS; At BS place, target femtocell, the current identification information of the identification information be included in handover request message and target femtocell BS is compared; And when the current identification information of the identification information be included in handover request message and target femtocell BS corresponds to each other, accept the switching of UE to target femtocell BS by target femtocell BS.
Accompanying drawing explanation
Following detailed description in conjunction with the drawings, above and other object of the present invention, feature and advantage will become more clear, wherein:
Fig. 1 is the schematic diagram that cordless communication network is according to an embodiment of the invention described;
Fig. 2 is the block diagram that UE is according to an embodiment of the invention described;
Fig. 3 is the flow chart of the changing method of the UE illustrated in wireless communication system according to an embodiment of the invention;
Fig. 4 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described;
Fig. 5 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described;
Fig. 6 is the flow chart of the operation that target femtocell base station in the handoff procedure of Fig. 5 is described;
Fig. 7 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described;
Fig. 8 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described; And
Fig. 9 illustrates according to an embodiment of the invention for supporting the block diagram of the configuration of the femto cell base station of handoff procedure.
Embodiment
Referring to accompanying drawing, various embodiment of the present invention is described.Reference numerals identical in whole accompanying drawing is used in reference to same or similar parts.In addition, the detailed description of the known function and structure be incorporated to here will be omitted to avoid fuzzy theme of the present invention.
Although following by using the term defined in 3GPP LTE standard to describe embodiments of the invention, the present invention is not limited thereto.
In addition, except as otherwise noted, term " community ", " base station " and " Node B " are used interchangeably at this.Equally, term " macrocell ", " macro cell base station " and " eNB " are used interchangeably; And term " Femto cell ", " femto cell base station ", " Femto cell eNB " and " HeNB " are used interchangeably.
Fig. 1 is the schematic diagram that cordless communication network is according to an embodiment of the invention described.
With reference to figure 1, cordless communication network comprises macro cell base station (eNB) 110, femto cell base station (HeNB) 120, mobile management entity (MME) 130, HeNB gateway (HeNB GW) 140 and UE 150.In addition, depend on System Implementation, HeNB GW 140 can be omitted.
ENB 110 is the base stations being in charge of macrocell.Macrocell is the community of typical cellular system, and eNB 110 is the base stations managing the macrocell limited by its wireless coverage.As implied above, term " macrocell " and " eNB " are here used interchangeably.
ENB 110 sets up with the wireless channel of UE 150 and controls Radio Resource.Such as, eNB 110 broadcast comprises the system information that UE 150 accesses the control information needed for eNB 110, and is used for swap data and control information to UE 150 distributing radio resource.ENB 110 also collects the channel measurement of Serving cell and the neighbor cell sent by UE 150, makes switching and determines, and instruction UE 150 performs switching.For this purpose, eNB 110 is equipped with control protocol, such as relevant with RRM radio resource protocol (RRC).
HeNB 120 is connected to core net to provide radio communication service to UE 150 via base station controller (not shown) and HeNB GW 140.HeNB 120 is usually called as " closed user group (CSG) community ", and it allows the particular group access Femto cell of UE.CSG cell is deployed in family, small enterprise or specific place for providing the cellular network of access service to particular organization.Foundation embodiments of the invention, HeNB 120 only allows access to the UE of previously registration, and at system information block (SIB) middle broadcast group identification information, that is, CSG ID.
MME 130 manages UE at the idling mode and selects packet data network (PDN) and gateway (not shown).MME 130 is also responsible for roaming and the authentication of UE.
According to embodiments of the invention, MME 130 specifically allows the identification information of the femto cell base station stored in CSG list about the access allowing UE at UE.MME 130 can send UE to service eNB 110 and UE 150 and specifically allow CSG list in the message of separating.
HeNB GW 140 is responsible for HeNB 120 to be connected to MME 130.As implied above, HeNB GW140 also can be omitted according to system embodiment.
UE 150 can be connected to core net via eNB 110 or HeNB 120.UE 150 receives UE from MME130 and specifically allows CSG list.UE 150 obtains the identification information of Femto cell (that is, HeNB) from the SIB that HeNB 120 broadcasts, and identifies HeNB 120 by the identification information of acquisition and UE specifically being allowed the CSG ID in CSG list to carry out mating.
UE 150 can receive the specific physical district ID in Femto cell from eNB 110 or HeNB 120, and uses specific physical district ID search synchronizing channel (SCH) in Femto cell and perform channel measurement.
As mentioned above, assuming that according to an embodiment of the invention cordless communication network be support the cellular system of eNB and HeNB.Although serving BS is eNB in the description provided below, the present invention is also suitable for when serving BS is HeNB.
In the following description, provide the serving BS of Mobile Communication Service in neighbouring relations table (NRT), have information about neighbouring femtocell to UE.The NRT of serving BS stores physical district ID (PCI), evolved universal mobile communication system (UMTS) grounding wireless access network (EUTRAN) community Global ID (ECGI), tracing area ID (TAI), indicates whether base station is the CSG designator of CSG base station and the information about CSC ID.
Fig. 2 is the block diagram that UE is according to an embodiment of the invention described.
Radio frequency (RF) unit 210, memory cell 220 and control unit 230 is comprised with reference to figure 2, UE.Memory cell 220 comprises permission CSG list storage area 220A.Control unit 230 comprises Femto cell identification information extractor 230A, access allows Femto cell determiner 230B and measurement report message generator 230C.
RF unit 210 comprises RF transceiver and duplexer.RF unit 210 is responsible for the wireless signal that process is sent by UE and receives.
Memory cell 220 stores the program relevant with the operation of UE and data.According to embodiments of the invention, memory cell 220 comprises permission CSG list storage area 220A.CSG list is allowed to comprise the identification information of the Femto cell that permission UE 150 utilizes the CSG ID of the Femto cell allowing access to access.As mentioned above, according to embodiments of the invention, send permission CSG list by MME 130.
The whole operation of control unit 230 control UE 150.Particularly, control unit 230 can comprise the data processing unit (not shown) having and send data processor and receive data processor.
Send data processor can comprise for the encoder of signal to be sent of encoding, for modulating the modulator of coded signal and the digital/analog converter for modulated signal being converted to analog signal.Encoder can comprise for the treatment of the data encoder of grouped data with for the treatment of the audio coder of audio signal comprising voice.
Receive analog/digital converter that the data processor analog signal that can comprise for being received by RF unit 210 is converted to digital signal, the decoder that demodulated signal decoded by the demodulator and being used for that is used for the digital signal that demodulation is exported by analog/digital converter.Decoder can comprise for the treatment of the data decoder of grouped data with for the treatment of the audio decoder of audio signal comprising voice.
In addition, control unit 230 comprises Femto cell identification information extractor 230A and access permission Femto cell determiner 230B.
When requiring to be switched to Femto cell, Femto cell identification information extractor 230A receives the system information sent by target femtocell base station, and from system information, extract the identification information of target femtocell base station.According to embodiments of the invention, system information comprises Master Information Block (MIB) or SIB.Although below provide system information to be the description of SIB, the present invention is not limited thereto.
According to embodiments of the invention, the identification information of target femtocell base station can be ECGI.Therefore, although provide identification information to be the description of CSG ID below, the present invention is not limited thereto.
Femto cell identification information extractor 230A allows Femto cell determiner 230B to transmit the identification information of the target femtocell base station extracted to access.
Access allows Femto cell determiner 230B from the identification information of Femto cell identification information extractor 230A receiving target femto cell base station, and the identification information of target femtocell base station and the ID be stored in the CSG list that allows access are compared, to determine whether target femtocell base station is the femto cell base station that permission accesses.
When target femtocell base station is the femto cell base station allowing access, measurement report message generator 230C produces the measurement report comprising the identification information received from target femtocell base station.Measurement report message generator 230C sends the measurement report message produced to serving BS.
Fig. 3 is the flow chart of the changing method of the UE illustrated in wireless communication system according to an embodiment of the invention.
With reference to figure 3, when requiring to switch, UE 150 detects target femtocell base station in step S310.In the detection of step S320, UE 150 to serving BS reporting objectives femto cell base station, and from the Femto cell sense command of serving BS receiving target.Receive the SIB broadcasted by target femtocell base station in step S330, UE 150, and from SIB, obtain the identification information of target femtocell base station.Here, the identification information of femto cell base station is CSG ID.
Allow the Femto cell list in access list to compare with being included in the identification information of target femtocell base station in step S340, UE 150, to determine whether target femtocell is the Femto cell allowing to access.If target femtocell is the Femto cell allowing access, then UE 150 comprises the measurement report message of the identification information (CSG ID) of acquisition in step S360 generation and sends measurement report message to serving BS.But if target femtocell is not the Femto cell allowing access, then UE 150 ignores the Femto cell of detection in step S350.
Send after measurement report message to serving BS in step S360, UE 150 is in step S370 wait-receiving mode switching command.When receiving switching command, UE 150 performs the switching of the femto cell base station detected in step S380.
Fig. 4 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described.More specifically, in the embodiment shown in fig. 4, the information about target femtocell base station is included in neighbouring relations table (NRT).
With reference to figure 4, serving BS 420 stores the information (such as PCI, CSG ID, ECGI and TAC of base station, each neighbouring femtocell) about base station, neighbouring femtocell in NRT.Serving BS 420 receives from MME 430 and allows access list, and stores in memory cell wherein and allow access list.
First serving BS 420 receives the ECGI of the target femtocell base station in the measurement report message sent by UE 150 in step S405.ECGI is mapped to femto cell base station for identifying the identifier of femto cell base station uniquely.Serving BS 420 stores ECGI in NRT.
After reception measurement report message, serving BS 420 checks whether the CSG ID of target femtocell is included in the permission CSG list of UE 150, and if comprise, then make decision that UE 150 is switched to target femtocell base station 450 in step S410.In step S415, serving BS 420 sends to source MME 430 and requires to switch message.
Or, when serving BS 420 does not comprise permission CSG list, omission step S410, and source MME 430 can make switching decision after it receives requirement switching message.
When needed, source MME 430 can send forwarding in step S420 to the target MME 440 that target femtocell base station 450 connects and reorientate request message.But, when target femtocell base station 450 is managed by source MME 430, reorientate message without the need to sending forwarding.
In step S425, target MME 440 sends handover request message to target femtocell base station 450.
When receiving handover request message, target femtocell base station 450 sends Handover Request Acknowledge (ACK) message in step S430 to target MME 440.
In step S435, target MME 440 sends forwarding to source MME 430 and reorientates response message, and in step S440, source MME sends switching command to Serving cell 420.
When receiving switching command, Serving cell 420 forwards switching command in step S445 to UE 150.
The switching of target femtocell base station 450 is performed in step S450, UE 150.
Fig. 5 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described.More specifically, in the embodiment shown in fig. 5, about the information of target femtocell base station not included in the NRT of serving BS.
With reference to figure 5, serving BS 420 does not store the information about base station, neighbouring femtocell in NRT.On the contrary, serving BS 420 receives from source MME 430 and allows CSG list and store to allow CSG list.CSG list is allowed to comprise the information of the neighbouring femtocell about the access allowing UE 150.
In step S501, when requiring to switch, the SIB of UE 150 receiving target femto cell base station 450 broadcast.UE 150 can receive SIB in response to the order sent by serving BS 420 or according to its oneself decision.
UE 150 obtains the identification information of target femtocell base station 450 from the SIB received; Such as, the identification information of target femtocell base station 450 is the CSG ID used by target femtocell base station 450.Afterwards, the identification information of target femtocell base station allows the value in CSG list to compare to determine whether target femtocell base station 450 allows the access of UE 150 with being included in by UE 150.If target femtocell base station 450 is the femto cell base stations allowing access, then UE 150 comprises the identification information of target femtocell base station 450, the measurement report message of ECGI and TAI in step S505 to serving BS 420 transmission.
Alternatively, the identification information of target femtocell base station 450 can be sent by some message outside measurement report message.
After reception measurement report message, serving BS 420 checks whether the identification information of target femtocell base station 450 is included in and allows in CSG list.Allow in CSG list if the identification information of target femtocell base station 450 is included in, then in step S510, serving BS 420 makes decision that UE is switched to target femtocell base station 450.Here, switch decision and can mean that switching is initiated and access control.
In step S515, serving BS sends to the source MME 430 being positioned at core net and requires to switch message.Require that switching message comprises the identification information of target femtocell base station 450.
Or, when serving BS 420 does not comprise permission CSG list, omit step S510, and in its reception, source MME 430 can require that make switching when switching message determines.
When needed, source MME 430 can send to the target MME 440 that target femtocell base station 450 connects the forwarding comprising the identification information of target femtocell base station 450 in step S520 and reorientate request message.But, when target femtocell base station 450 is managed by source MME 430, reorientate message without the need to sending forwarding.
In step S525, target MME 440 sends the handover request message comprising the identification information of target femtocell base station 450 to target femtocell base station 450.
Now, target femtocell base station 450 verifies the identification information provided from UE to serving BS.More specifically, in step S530, because the identification information of target femtocell base station can change and the identification information reported by UE 150 non-fully is reliable at any time, target femtocell base station 450 by identification information (namely, the CSG ID sent from UE to serving BS) compare to determine that whether they are corresponding with its oneself identification information (that is, its current C SG ID).
If identification information corresponds to each other, then target femtocell base station 450 receives its switching in step S535 and sends handover request ACK message to target MME 440.But if identification information is not corresponding each other, then target femtocell base station sends switch failure information to target MME 440, notify the refusal to switching to UE 150.
In step S540, target MME 440 sends forwarding to source MME 430 and reorientates response message, and in step S545, source MME 430 sends switching command to serving BS 420, and in step S550, serving BS 420 forwards switching command to UE 150.
The switching of target femtocell base station 450 is performed in step S555, UE 150.
Afterwards, other information controlled about switching and the mobility of UE in network 150 can be sent to serving BS 420 by measurement report message.
Fig. 6 is the flow chart of the operation that target femtocell base station in the handoff procedure of Fig. 5 is described.
With reference to figure 6, target femtocell base station 450 receives from serving MME 430 or target MME 440 the handover request message comprising the identification information (e.g., CSG ID) of target femtocell base station in step S610.In step S620, target femtocell base station 450 determines whether the identification information be included in handover request message corresponds to its current identification information.That is, target femtocell base station 450 determines whether the CSG ID of the report from UE 150 to serving BS mates with its current C SG ID.
When the CSG ID received mates with current CSG ID, this means that target femtocell base station 450 is successfully detected by UE 150, thus, target femtocell base station 450 is in the MME transmission handover request ACK message of step S630 to correspondence.But, when the CSG ID received does not mate with current CSG ID, this means that UE 150 reports incorrect identification information to its serving BS, therefore, target femtocell base station 450, in the MME transmission switch failure information of step S640 to correspondence, notifies that this switching is attempted being rejected.
Fig. 7 is the sequence chart of the operation of network entity when UE performs the switching of femto cell base station illustrated according to the third embodiment of the invention.More specifically, in the embodiment shown in fig. 7, about the information of target femtocell base station not included in the NRT of serving BS, and target MME knows the identification information of target femtocell base station.
With reference to figure 7, serving BS 420 does not store the information about base station, neighbouring femtocell in NRT.On the contrary, serving BS 420 receives the permission CSG list of the information of the neighbouring femtocell comprised about the access allowing UE 150.In addition, target MME440 knows the identification information (that is, CSG ID) of target femtocell base station 450.
When requiring to switch, the SIB that UE 150 broadcasts in step S705 receiving target femto cell base station 450.UE 150 can receive SIB in response to the order sent by serving BS 420 or according to its oneself decision.
Based on the identification information (that is, CSG ID) received, UE 150 determines that whether target femtocell base station 450 is the Femto cell of the access allowing UE 150.If target femtocell base station 450 is the femto cell base stations allowing access, then UE 150 sends the measurement report message comprising the identification information of target femtocell base station 450 to serving BS 420 in step S710.
Alternatively, the identification information of target femtocell base station 450 can be sent by some message outside measurement report message.
After receiving measurement report message, serving BS 420 checks whether the identification information of target femtocell base station 450 is included in and allows in CSG list.Allow in CSG list if the identification information of target femtocell base station 450 is included in, then in step S715, serving BS 420 makes decision that UE 150 is switched to target femtocell base station 450, and sends requirement switching message in step S720 to source MME 430.Require that switching message comprises the identification information of target femtocell base station 450, such as CSG ID, ECGI and TAI.
Or, when serving BS 420 does not comprise permission CSG list, omit step S715, and in its reception, source MME 430 can require that make switching when switching message determines.
When needed, source MME 430 can send to the target MME 440 that target femtocell base station 450 connects the forwarding comprising the identification information of target femtocell base station 450 in step S725 and reorientate request message.But, when target femtocell base station 450 is managed by source MME 430, reorientate message without the need to sending forwarding.
In Fig. 7, assuming that each femto cell base station has single subdistrict, and target MME 440 has the identification information of whole femto cell base station.
In step S730, target MME 440 is compared by the identification information of target femtocell base station 450 being attempted being switched to by UE 150 and the actual identification information of target femtocell base station 450 and verifies target femtocell base station 450.When two identification informations correspond to each other, handoff procedure continues.But, when two identification informations are each other to utilizing the switching refusal of target MME 440 to notify handoff failure to UE during correspondence.
When having determined that two identification informations correspond to each other in step S730, target MME 440 sends handover request message in step S735 to target femtocell base station 450, and target femtocell base station 450 sends the handover request ACK message of the acceptance that notice switches to target MME 440 in response to handover request message in step S740.
In step S745, target MME 440 sends forwarding to source MME 430 and reorientates response message, and in step S750, source MME 430 sends switching command to serving BS 420, and in step S755, serving BS 420 forwards switching command to UE 150.
The switching of target femtocell base station 450 is performed in step S760, UE 150.
Afterwards, other information controlled about switching and the mobility of UE in network 150 can be sent to serving BS 420 by measurement report message.
Fig. 8 is the sequence chart of the operation that the network entity when UE performs the switching of femto cell base station is according to an embodiment of the invention described.More specifically, in the embodiment shown in fig. 8, about the information of target femtocell base station not included in the NRT of serving BS.
With reference to figure 8, serving BS 420 does not store the information about base station, neighbouring femtocell in NRT, and does not store permission CSG list.
When requiring to switch, the SIB that UE 150 broadcasts in step S805 receiving target femto cell base station 450.UE 150 can receive this SIB in response to the order sent by serving BS 420 or according to its oneself decision.
Based on the identification information (that is, CSG ID) received, UE 150 determines that whether target femtocell base station 450 is the Femto cell of the access allowing UE 150.If target femtocell base station 450 is the femto cell base stations allowing access, then UE 150 sends the measurement report message comprising the identification information (such as CSG ID, ECGI and TAI) of target femtocell base station 450 to serving BS 420 in step S810.
Alternatively, the identification information of target femtocell base station 450 can be sent by some message outside measurement report message.
After receiving measurement report message, the switching that serving BS is made about UE 150 in step S815 determines, or sends requirement switching message in step S820 to source MME 430, and source MME 430 makes switching decision in step S825.
As mentioned above, serving BS 420 does not allow CSG list, thus, only can determine switch execution (that is, switching initiation) and will switch the MME determining to leave in core net.
More specifically, serving BS 420 sends the identification information of target femtocell base station 450 to source MME 430, and in step S825, source MME 430 checks whether the CSG ID of target femtocell base station 450 is included in the permission CSG list of UE 150 and determines to make switching.When the CSG ID of target femtocell base station 450 is included in the permission CSG list of UE 150, performs switching, and when the CSG ID of target femtocell base station 450 is not included in the permission CSG list of UE 150, do not perform switching.
When needed, source MME 430 sends to the target MME 440 that target femtocell base station connects the forwarding comprising the identification information of target femtocell base station 450 in step S830 and reorientates request message.But, when target femtocell base station 450 is managed by source MME 430, reorientate message without the need to sending forwarding.
Target MME 440 sends the handover request message comprising the identification information of target femtocell base station 450 to target femtocell base station 450 in step S835.
Again, target femtocell base station 450 verifies the identification information of the target femtocell base station 450 provided from UE 150 to serving BS, because the identification information of target femtocell base station can change and the identification information reported by UE 150 non-fully is reliable at any time.
Therefore, in step S840, the identification information (that is, current C SG ID) of identification information (that is, the CSG ID sent from UE to serving BS) and its oneself compares to determine that whether they are corresponding by target femtocell base station 450.If identification information corresponds to each other, then target femtocell base station 450 receives its switching in step S845 and sends handover request ACK message to target MME 440.But if identification information is not corresponding each other, then target femtocell base station 450 sends switch failure information to target MME440, notifies the refusal to switching to UE 150.
In step S850, target MME 440 sends forwarding to source MME 430 and reorientates response message, and in step S855, source MME 430 sends switching command to serving BS 420, and in step S860, serving BS 420 forwards switching command to UE 150.
The switching of target femtocell base station 450 is performed in step S865, UE 150.
Afterwards, other information controlled about switching and the mobility of UE in network 150 can be sent to serving BS 420 by measurement report message.
Fig. 9 illustrates according to an embodiment of the invention for supporting the block diagram of the configuration of the femto cell base station of handoff procedure.
With reference to figure 9, femto cell base station comprises RF unit 910, memory cell 920 and control unit 930.Memory cell 920 comprises cell information storage area 920A, and control unit 930 comprises cell ID validator 930A.
RF unit 910 comprises RF transceiver and duplexer (not shown), and is responsible for processing RF signals.RF unit 910 receives the handover request message sent by source MME 430 or target MME 440.Here, handover request message can carry the identification information that UE 150 attempts the target femtocell base station 450 of access.
Memory cell 920 stores the program relevant to the operation of target femtocell base station 450 and data.In addition, the cell information storage area 920A be included in memory cell 920 stores the cell information of target femtocell base station.Cell information comprises ECGI, CSG ID and TAI of target femtocell base station 450.
Control unit 930 controls the whole operation of femto cell base station.Control unit 930 control RF unit 910 receives and processes the handover request message sent by source MME 430 or target MME 440.If received handover request message, then control unit 930 has extracted the identification information of target femtocell base station 450 from handover request message, and sends identification information to cell ID validator 930A.
The identification information (that is, CSG ID) that UE 150 reports to its serving BS 420 by cell ID validator 930A compares to determine whether they correspond to each other with the current identification information of femto cell base station 450.If two CSG ID correspond to each other, then cell ID validator 930A accepts switching, and controls femto cell base station 450 and send handover request ACK message to target MME 440 or source MME 430.
But if two CSG ID are not corresponding each other, then cell ID validator 930A sends switch failure information, the switching of notice UE 150 is rejected.
As mentioned above, switching method and apparatus of the present invention promotes that UE is to the switching of Femto cell in the wireless communication system supporting Femto cell and macrocell.
Although below describe specific embodiments of the invention in detail, but be understood that, many changes and/or the amendment of the basic conception of the present invention of the teaching here that those skilled in the art can expect will drop in the spirit and scope of the present invention be defined by the appended claims.

Claims (18)

1. comprise a changing method for the subscriber equipment (UE) in the wireless communication system of family e Node B (HeNB), the method comprises:
Send the first measurement report to source e Node B (eNB), the first measurement report comprises the cell identifier (ID) of target HeNB;
The control message being used for executive system acquisition of information is received from source eNB;
The system information comprising community ID, tracing area ID (TAI) and closed user group (CSG) ID is received from target HeNB;
Produce and send the second measurement report, the second measurement report comprises TAI and CSGID of target HeNB; And
Switching command message is received from source eNB.
2. changing method as claimed in claim 1, wherein, verifies whether the CSG ID in the second measurement report mates with the CSG ID broadcasted from target HeNB.
3. changing method as claimed in claim 2, wherein, the CSGID be included in the second measurement report is used to the access control in mobile management entity (MME).
4. changing method as claimed in claim 1, wherein, by target HeNB, the CSG ID be included in the second measurement report and the CSG ID broadcasted in target HeNB are compared to verify whether the CSG ID in the second measurement report mates with the CSG ID broadcasted in target HeNB.
5. changing method as claimed in claim 1, wherein, if the CSGID being sent to target HeNB is verified, then receives switching command message from source eNB.
6. changing method as claimed in claim 1, comprises further:
Handoff procedure is initiated in response to reception switching command message.
7. one kind performs the subscriber equipment (UE) of switching in the wireless communication system comprising family e Node B (HeNB), and this UE comprises:
Transceiver, is configured to send and Received signal strength; And
Controller, be configured to send the first measurement report to source e Node B (eNB), first measurement report comprises the cell identifier (ID) of target HeNB, the control message being used for executive system acquisition of information is received from source eNB, the system information comprising community ID, tracing area ID (TAI) and closed user group (CSG) ID is received from target HeNB, produce and send the second measurement report, second measurement report comprises TAI and the CSG ID of target HeNB, and receives switching command message from source eNB.
8. UE as claimed in claim 7, wherein, verifies whether the CSG ID in the second measurement report mates with the CSG ID broadcasted from target HeNB.
9. UE as claimed in claim 8, wherein, the CSG ID be included in the second measurement report is used to the access control in mobile management entity (MME).
10. UE as claimed in claim 7, wherein, by target HeNB, the CSG ID be included in the second measurement report and the CSG ID broadcasted in target HeNB are compared to verify whether the CSG ID in the second measurement report mates with the CSG ID broadcasted in target HeNB.
11. UE as claimed in claim 7, wherein, if the CSG ID being sent to target HeNB is verified, then receive switching command message from source eNB.
12. UE as claimed in claim 7, wherein this controller is configured in response to reception switching command message and initiates handoff procedure.
13. 1 kinds comprise source e Node B (eNB) in the wireless communication system of family e Node B (HeNB), and this source eNB comprises:
Transceiver, is configured to send and Received signal strength; And
Controller, be configured to receive the first measurement report from subscriber equipment (UE), first measurement report comprises the cell identifier (ID) of target HeNB, the control message being used for executive system acquisition of information is sent to UE, receive the second measurement report, second measurement report comprises tracing area ID (TAI) and closed user group (CSG) ID of target HeNB, and sends switching command message to UE.
14. source eNB as claimed in claim 13, wherein, verify whether the CSG ID in the second measurement report mates with the CSG ID broadcasted from target HeNB.
15. source eNB as claimed in claim 14, wherein, the CSGID be included in the second measurement report is used to the access control in mobile management entity (MME).
16. source eNB as claimed in claim 13, wherein, by target HeNB, the CSG ID be included in the second measurement report and the CSG ID broadcasted in target HeNB are compared to verify whether the CSG ID in the second measurement report mates with the CSG ID broadcasted in target HeNB.
17. source eNB as claimed in claim 13, wherein, if the CSG ID be included in the second measurement report is verified, then send switching command message to UE.
18. source eNB as claimed in claim 13, wherein switching command message is used for UE initiation handoff procedure.
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